https://www.theguardian.com/technology/2019/mar/16/apple-watch-study-heart-problems-stanford-atrial-fibrillation

More work needed to see if wearables can help screen for heart problems, but researchers call study encouraging

A huge study suggests the Apple Watch can detect a worrisome irregular heartbeat – but experts say more work is needed to tell if using wearable technology to screen for heart problems really helps.